berkaysynnada commented on code in PR #10117:
URL: https://github.com/apache/datafusion/pull/10117#discussion_r1590633167
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datafusion/expr/src/signature.rs:
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@@ -346,13 +346,75 @@ impl Signature {
}
}
-/// Monotonicity of the `ScalarFunctionExpr` with respect to its arguments.
-/// Each element of this vector corresponds to an argument and indicates
whether
-/// the function's behavior is monotonic, or non-monotonic/unknown for that
argument, namely:
-/// - `None` signifies unknown monotonicity or non-monotonicity.
-/// - `Some(true)` indicates that the function is monotonically increasing
w.r.t. the argument in question.
-/// - Some(false) indicates that the function is monotonically decreasing
w.r.t. the argument in question.
-pub type FuncMonotonicity = Vec<Option<bool>>;
+#[derive(Debug, Clone, PartialEq)]
Review Comment:
Thanks @tinfoil-knight. I can just say this `PartialEq` derivation could be
dangerous here. One can expect to see the equality of Increasing and
vec![Some(true)].
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